如何在迭代期间从列表中减去字符串值?扑 [英] How to subtract a String Value from a List during Iteration? Flutter

问题描述

我有一个小部件构造函数列表，它们是字符串，用于不同的类.该列表由 39 个标签组成，这 39 个标签具有不同的文本，有些页面只有 7 个标签，如何在迭代期间仅显示类显示为字符串的标签数量?

I have a list with widget constructors which are strings, that are used in different classes. The list consists of 39 labels and these 39 labels have different text some pages will have only 7 labels, how during iteration can i show only the number of labels that the class displays as a string?

List<String> tests;
// @override
// void initState() {
// super.initState();     tests = [widget.label00, widget.label0]; }

  @override
  void initState() {
    super.initState();
    tests = [
      widget.label00,
      widget.label0,
      widget.label1,
      widget.label2,
      widget.label3,
      widget.label4,
      widget.label5,
      widget.label6,
      widget.label7,
      widget.label8,
      widget.label9,
      widget.label10,
      widget.label11,
      widget.label12,
      widget.label13,
      widget.label14,
      widget.label15,
      widget.label16,
      widget.label17,
      widget.label18,
      widget.label19,
      widget.label20,
      widget.label21,
      widget.label22,
      widget.label23,
      widget.label24,
      widget.label25,
      widget.label26,
      widget.label27,
      widget.label28,
      widget.label29,
      widget.label30,
      widget.label31,
      widget.label32,
      widget.label33,
      widget.label34,
      widget.label35,
      widget.label36,
      widget.label37,
      widget.label38,
      widget.label39
    ];

    // List<ReusableLarge> translationTextsss = [
    //   ReusableLarge(label00: "test00"),
    //   ReusableLarge(label0: "test0"),
    //   ReusableLarge(label1: 'test1'),
    //   ReusableLarge(label2: 'test2'),
    //   // ),
    // ];

    Timer.periodic(Duration(seconds: 5), (Timer timer) {
      if (widget.label7 == '') {
        setState(() {
          tests.length - 1;
        });

        if (_currentPage < tests.length) {
          _currentPage++;
        } else {
          _currentPage = 0;
        }

        _pageController.animateToPage(
          _currentPage,
          duration: Duration(milliseconds: 350),
          curve: Curves.easeIn,
        );
      }
    });
  }

和显示字符串的类之一:我该怎么做才能使带有标签的卡片:'' 不显示?我尝试了 tests.length-1 但它显示了一条摆动的线条我希望 tests.length 根据该标签是否包含字符串而改变.

and one of the classes that show the strings: how can i do it so the cards that have label: '' to not display?? I tried tests.length-1 but its showing a swiggly lines i want the tests.length to change based on whether that label contains a string or not.

label00: 'Surah Fatiha' + '\n' + 'The Opening',
      label0: 'In the name of God, the Lord of Mercy, the Giver of Mercy!',
      label1: 'AYAH 1: Praise belongs to God, Lord of the Worlds,',
      label2: 'AYAH 2: the Lord of Mercy, the Giver of Mercy,',
      label3: 'AYAH 3: Master of the Day of Judgement.',
      label4: 'AYAH 4: It is You we worship; it is You we ask for help.',
      label5: 'AYAH 5: Guide us to the straight path:',
      label6:
          'AYAH 6: the path of those You have blessed, those who incur no anger and who have not gone astray.',
      label7: '',
      label8: 'label8',
      label9: '',
      label10: '',
      label11: '',
      label12: '',
      label13: '',
      label14: '',
      label15: '',
      label16: "",
      label17: '',
      label18: '',
      label19: '',
      label20: '',
      label21: '',
      label22: '',
      label23: '',
      label24: '',
      label25: '',
      label26: '',
      label27: "",
      label28: '',
      label29: '',
      label30: '',
      label31: '',
      label32: '',
      label33: '',
      label34: '',
      label35: '',
      label36: '',
      label37: '',
      label38: '',
      label39: '',

推荐答案

我能够通过一个包含所有小部件的列表循环它们并将其添加到另一个列表中来克服这个障碍，这对我正在寻找的东西产生了奇迹为了:结果 = [];

I was able to get through this road block by having one list with all the widgets looping them and adding it to another list which worked wonders for what i was looking for: results = [];

for (int i = 0; i < tests.length; i++) {
  if (widget.label00 != '') {
    results.add(widget.label00);
  }
  if (widget.label0 != '') {
    results.add(widget.label0);
  }
  if (widget.label1 != '') {
    results.add(widget.label1);
  }
  if (widget.label2 != '') {
    results.add(widget.label2);
  }
  if (widget.label3 != '') {
    results.add(widget.label3);
  }
  if (widget.label4 != '') {
    results.add(widget.label4);
  }
  if (widget.label5 != '') {
    results.add(widget.label5);
  }
  if (widget.label6 != '') {
    results.add(widget.label6);
  }
  if (widget.label7 != '') {
    results.add(widget.label7);
  }
  if (widget.label8 != '') {
    results.add(widget.label8);
  }
  if (widget.label9 != '') {
    results.add(widget.label9);
  }
  if (widget.label10 != '') {
    results.add(widget.label10);
  }
  if (widget.label11 != '') {
    results.add(widget.label11);
  }
  if (widget.label12 != '') {
    results.add(widget.label12);
  }
  if (widget.label13 != '') {
    results.add(widget.label13);
  }
  if (widget.label14 != '') {
    results.add(widget.label14);
  }
  if (widget.label15 != '') {
    results.add(widget.label15);
  }
  if (widget.label16 != '') {
    results.add(widget.label16);
  }
  if (widget.label17 != '') {
    results.add(widget.label17);
  }
  if (widget.label18 != '') {
    results.add(widget.label18);
  }
  if (widget.label19 != '') {
    results.add(widget.label19);
  }
  if (widget.label20 != '') {
    results.add(widget.label20);
  }
  if (widget.label21 != '') {
    results.add(widget.label21);
  }
  if (widget.label22 != '') {
    results.add(widget.label22);
  }
  if (widget.label23 != '') {
    results.add(widget.label23);
  }
  if (widget.label24 != '') {
    results.add(widget.label24);
  }
  if (widget.label25 != '') {
    results.add(widget.label25);
  }

  if (widget.label26 != '') {
    results.add(widget.label26);
  }
  if (widget.label27 != '') {
    results.add(widget.label27);
  }
  if (widget.label28 != '') {
    results.add(widget.label28);
  }
  if (widget.label29 != '') {
    results.add(widget.label29);
  }
  if (widget.label30 != '') {
    results.add(widget.label30);
  }
  if (widget.label31 != '') {
    results.add(widget.label31);
  }
  if (widget.label32 != '') {
    results.add(widget.label32);
  }
  if (widget.label33 != '') {
    results.add(widget.label33);
  }
  if (widget.label34 != '') {
    results.add(widget.label34);
  }
  if (widget.label35 != '') {
    results.add(widget.label35);
  }
  if (widget.label36 != '') {
    results.add(widget.label36);
  }
  if (widget.label37 != '') {
    results.add(widget.label37);
  }

这篇关于如何在迭代期间从列表中减去字符串值?扑的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！